comphead commented on code in PR #19552:
URL: https://github.com/apache/datafusion/pull/19552#discussion_r2656793142


##########
benchmarks/README.md:
##########
@@ -240,6 +240,21 @@ Benchmark tpch_mem.json
 └──────────────┴──────────────┴──────────────┴───────────────┘
 ```
 
+## Comparing performance of main and a PR
+
+### TPCDS
+
+Considering you already have TPCDS data locally
+
+```shell
+export DATA_DIR=../../datafusion-benchmarks/tpcds/data/sf1/
+export PR_NUMBER=19464
+gh pr checkout $PR_NUMBER --repo apache/datafusion -b pr-$PR_NUMBER

Review Comment:
   Thanks, I'll add alternative



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